Honda CR-V v-tec 2.0 petrol code p2138

Hi I have a problem Honda CR-V 2.0 petrol v-tec registration 56 , code p2138  throttle/ pedal- position sensor switch d/e voltage correlation , the car goes to limb mode , I know the part I need it’s the little black sensor on the top of Carburettor I have been on the internet 3 days I have rang around for this part it’s Unavailable main Dealer so I rang they said can’t get it has to be a whole new carburettor £1500.00 no way, I have looked on eBay they have but not for my car 2.0 petrol v-tec ??? So can I use a different one, is it the same part for all the cars. 
please can someone help I don’t want to buy a whole new carburettor.